The San Juan Mountains are more than a rugged landscape that man can utilize for his own benefit. These mountains are the home for a profusion of plants and animals whose life systems are patterned by regular cycles of nature. In recent years we have realized that man, too, depends on nature's cycles, that man must not disrupt nature's harmony. To learn more about how nature's system might be affected by cloud seeding, the pilot project research continues on into summer. Now the emphasis is on ecology. These men and women seek to learn what effect nature's own variations in snowfall have on the plants and animals. All the research data are correlated with the amount of snow that fell during the previous winter. After four years of their study, the ecologists hope to know what small changes, if any, will occur in the plants and animals if cloud seeding is used to help even out the year to year pattern of snowfall. Students and scientist from many different states and from foreign countries are assisting in the program.